<template>
<div class="list" ref="wrapper">
  <div>
    <div class="area">
      <div class="title border-topbottom">当前城市</div>
      <div class="button-list">
        <div class="button-wrapper">
          <div class="button">{{this.currentCity}}</div>
        </div>
      </div>
    </div>
    <div class="area">
      <div class="title border-topbottom">热门城市</div>
      <div class="button-list">
        <div class="button-wrapper" v-for="item of hot" :key="item.id" @click="handleCityClick(item.name)">
          <div class="button">{{item.name}}</div>
        </div>
      </div>
    </div>
    <div class="area" v-for="(item, key) of cities" :key="key" :ref="key">
      <div class="title border-topbottom">{{key}}</div>
      <div class="item-list">
        <div class="item border-bottom" v-for="innnerItem of item" :key="innnerItem.it"  @click="handleCityClick(innnerItem.name)">{{innnerItem.name}}</div>
      </div>
    </div>
  </div>
</div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapState, mapMutations } from 'vuex'
export default {
  name: 'CtiyList',
  props: {
    hot: Array,
    cities: Object,
    letter: String
  },
  methods: {
    handleCityClick (city) {
      // this.$store.dispatch('changeCity', city) 普通写法
      this.changeCity(city)
      this.$router.push('/')
    },
    // 使用Vuex官方提供的方法，将Mutations的映射的方法中
    ...mapMutations(['changeCity'])
  },
  computed: {
    // 使用Vuex官方提供的方法，将state的数据映射到其它数值上
    ...mapState({
      currentCity: 'city'
    })
  },
  watch: {
    letter () {
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        // Bscroll提供的跳转元素位置的方法
        this.scroll.scrollToElement(element)
      }
    }
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.wrapper)
  }
}
</script>

<style lang="stylus" scoped>
@import '~@styles/varibles.styl';
.border-topbottom
  &:before
    border-color #cccccc
  &:after
    border-color #cccccc
.border-bottom
  &:before
    border-color #cccccc
.list
  position absolute
  top 1.78rem
  left 0
  right 0
  bottom 0
  overflow hidden
  .title
    line-height .54rem
    background #eeeeee
    padding-left .2rem
    color #666
    font-size .26rem
  .button-list
    padding .1rem .6rem .1rem .1rem
    overflow hidden
    .button-wrapper
      width 33.33%
      float left
      .button
        text-align center
        margin .1rem
        padding .1rem 0
        border-radius .06rem
        border .02rem solid #cccccc
  .item-list
    .item
      line-height .76rem
      padding-left .2rem
</style>
